[Mimedefang] DNS Lookups in MD - Was RBL and DNS lookups

[Les Mikesell]

Jeff Rife wrote:

>> Get the perl module from CPAN. Net::validMX.
> 
> Already tested.  For me, it only stops about 1% from getting to SA that 
> wasn't being stopped through non-network tests.  That's not worth the 
> code or the DNS lookup.
> 
>> in filter_sender add something like this:
>>
>> if ($sender ne '<>') {
> 
> Why would you restrict it this way?  If someone is bouncing and they 
> don't have a valid MX, then you never sent them mail anyway, and it's a 
> spoof.  So, *anything* without a valid MX should be tossed.

A bounce doesn't necessarily come from an address where you sent the
mail - it can come from somewhere after forwarding.

-- 
   Les Mikesell
    lesmikesell at gmail.com